The paper introduces a novel pilot transmission scheme based on 5G OFDM systems to address high-mobility mmWave channels. By utilizing tensor theory, the received signals are formed into a fourth-order tensor, enabling channel estimation through CP decomposition. The proposed method accurately estimates channel parameters like angles, delays, gains, and Doppler shifts. Simulation results validate the effectiveness of the approach in practical scenarios. The uniqueness condition of CP decomposition is analyzed to ensure accurate parameter estimation. Additionally, compressed sensing methods are discussed for channel estimation in mmWave systems.
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arxiv.org
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